Add layout section on the top of Demo page to make it easy to see how themes look like when the controls are used together

This would be easy to see how all the controls look like when used together.

![screen shot 2013-11-18 at 11 47 52 am](https://f.cloud.github.com/assets/1171793/1566810/16610fcc-5095-11e3-9fca-fcceb1d12528.png)